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B2 Vital Relays

Compact High-Density Fail-Safe Relays for Advanced Railway Signaling

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B2 Vital Relays are used in railway signaling, where higher functional density and optimized space utilization are required. Their design supports reliable operation under power loss or abnormal conditions, ensuring a defined safe response through controlled mechanical behavior.


With a more compact internal arrangement, B2 relays accommodate additional contacts and functions while maintaining vital performance. They are commonly applied in modern interlocking systems, coded signaling, and other advanced railway control applications where flexibility and efficiency are essential.

  • B2 Code Transmitter
  • B2 Code Responsive
  • B2 Neutral Normal Release
  • B2 Neutral Slow-Acting
  • B2 Biased Neutral
  • B2 Vital Timer
  • B2 Power Transfer

A biased neutral relay built in a B2 vital construction for railway signaling applications

Biased Neutral Relay:

  • Used in signaling systems where it is essential to ensure that the relay only changes state under specific current or voltage conditions.



  • Combines the features of neutral and polarized relays, using a bias to ensure that the relay only operates when conditions are precisely as designed, thereby providing a more robust fail-safe mechanism


Vital timer relay in a B2 vital design used for timing functions in railway signaling systems

Vital Timer Relay

  • Electronically controlled to provide operation after a preset time.
Neutral line relay configured as a B2 vital relay for compact railway signaling installations

Neutral Line Relay

  • Employed in signaling systems where precise and secure control of signal positions is required.



  • Types of Neutral Line Relays:

 - Flasher Relays

 - Switch Control Relays

 - Switch Overload Relays

 - Power Transfer Relays